At 10 months old
- 3-4 hours of daytime naps (over 2 naps) and
- 10-11 hours of night time unbroken sleep
Is really not unusual. In fact it is quite 'normal'
With a 6.30pm bedtime, it really is not surprising that baby is waking from between 4.30-5.30. It indicates 10-11 hours of sleep, which is about right. You need to decide long-term what is more important to you - having a longer child-free evening or not having to get up mega early?
When I had my first 2 children, my evenings were important. They went to bed at 6-6.30 (like yours) and we just accepted the early mornings. With DC3 and DC4, we already have older children around in the early evening, so there is no benefit for me and DH getting youngest to bed super early. So DC4 (23 months now) has been going to bed 7.30-8.00pm from when she first had a bedtime. It means she's normally awake sometime around 6.30-7am.
If you want to get wake-up later, this is not a case of just putting her to bed later and hoping that will work. It will take gradual changes over-time and it will take time to become established. You may have to deal with some over-tiredness in the transition, but if you are consistent, you can shift things (to a degree - some people will always be Early Birds or Night Owls).
An important factor is that morning nap. An early morning nap actively encourages an early wake up. I believe your morning nap will be having more of an impact on early wake-ups than the bedtime (although I would still move that bedtime a bit)
I would work towards getting that morning nap to be more like 9.00am-11am and then 2pm-4pm afternoon nap. Then aiming for a 7-7.30pm bedtime. That is all easier said than done! It is not a case of just keeping baby awake until 9am when she's wanting a nap at 6.30am. Make some gradual changes.
Decide initially that you'll keep her going until 7am at least. If she cant always manage this don't worry, but aim for it as much as possible. Do the same at bedtime. Aim for a bedtime not before 6.30pm initially. Don't worry if it's not always the case, but keep her going when possible.
Once this is established, move the morning nap by an additional 15 minutes - not before 7.15am. Then another 15 minutes, and another, and so on. Slow, gradual changes to move that morning nap significantly later (you have a 2 and a half hour move for that morning nap - which is a lot).
In the time you are doing this, you may well have an over-tired baby because initially morning wake-up time may still be early. Moving an entire routine isn't a simple, easy thing to do. But it will be worth it in the end. And - importantly - it is entirely possible.